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| Number | Title | Issue Date |
| 7422730 | Nanoporous ultrafine α-alumina powders and sol-gel process of preparing same The present invention provides α-alumina powders comprising α-alumina particles of which at least 80% of the α-alumina particles have a particle size of less than 100 nm. The invention also provides slurries, particularly aqueous slurries, which comprise α-alumi... | 09/09/2008 |
| 7351394 | Method for producing α-alumina powder A method for producing an α-alumina powder is described. The method for producing an α-alumina powder comprises a step of calcining an aluminum salt in the presence of a seed crystal at 600-890° C. ... | 04/01/2008 |
| 7235224 | Process for preparing fine metal oxide particles Disclosed is a process for preparing fine metal oxide particles, comprising the following steps of reacting a reactant mixture comprising i) water, ii) at least one water-soluble metal nitrate and iii) ammonia or ammonium salt at 250–700° C. under 180–550 bar f... | 06/26/2007 |
| 7090824 | Mesostructured transition aluminas Mesoporous crystalline alumina compositions and process for the preparation thereof are described. The compositions are useful as catalysts and absorbents. ... | 08/15/2006 |
| 7078010 | Method for producing α-alumina powder A method for producing α-alumina powder is described. The method comprises the steps of removing water from a compound containing the following (1), (2), (3) and (4), and calcining the results: (1) α-alumina precursor, ... | 07/18/2006 |
| 6761866 | Single step process for the synthesis of nanoparticles of ceramic oxide powders The present invention relates to a single step process for the synthesis of nanoparticles of phase pure ceramic oxides of a single or a multi-component system comprising one or more metal ions. The process comprises preparing a solution containing all the required m... | 07/13/2004 |
| 6518219 | Catalyst for hydrorefining fraction oils, its carrier and preparation A catalyst for hydrofining fraction oils, comprises an alumina carrier and at least one metal and/or thereof oxide of Group VIB and at least one metal and/or thereof oxide of Group VIII supported on said alumina carrier. The pore volume of said alumina ca... | 02/11/2003 |
| 6214312 | Process for synthesising aluminas in a basic medium The invention concerns a process for synthesising aluminas with a controlled porosity in which the pore diameter is in the range 0.6 nm to 80 nm. This process is carried out in a plurality of steps including at least one step a) in which an alumina precur... | 04/10/2001 |
| 5855862 | Process for the preparation of an oxide, especially a transition metal oxide A method for preparing an oxide (P), which includes the steps of (i) forming a solid phase compound (O) based on an oxide containing molecular entities (1) chosen from optionally substituted ammonium, diammonium, diazan-ium or diazandium, the entities bei... | 01/05/1999 |
| 5688730 | Optically transparent gamma-aluminum oxynitride powders and ceramic articles shaped therefrom Gamma-aluminum oxynitride ground powders, white in color and well suited for conversion into optically transparent ceramic shaped articles, 100% of the particles of which being less than 10 μm in size and exhibiting a transmittance of at least 8%, are pr... | 11/18/1997 |
| 5302368 | Process for preparation of alumina An aqueous slurry of about 100-1000 centipoises viscosity suspending about 200-2000 g/l of aluminum hydroxide particles smaller than 5 μm is spray-dried, and the dried powders are calcined to obtain alumina powders. The alumina powders have a sharp parti... | 04/12/1994 |
| 5075265 | Preparation of aluminum oxynitride from organosiloxydihaloalanes Aluminum oxynitride is prepared by the pyrolysis of an organosiloxydihaloalane such as trimethylsiloxydichloroalane in the presence of a nitrogen-containing atmosphere. The organosiloxydihaloalane may conveniently be prepared by reacting together an alumi... | 12/24/1991 |
| 5049371 | Process for the preparation of monodisperse ceramic powders A novel process is described for the preparation of monodisperse ceramic ders wherein particulate oxides or hydroxides are obtained by reaction of hydrolysable compounds with water. The reaction is carried out in the presence of a complexing agent and, o... | 09/17/1991 |
| 5032378 | Zirconium-doped pseudobehmite, process for its production and use thereof Zirconium-doped pseudoboehmite with the following properties: zirconium content of 0.5 to 10 mol % relative to Al water content of 20 to 35 weight percent total of the anionic impurities less than 0.5 weight percent. It is synthesized by a process wherein... | 07/16/1991 |
| 4937062 | High surface area metal oxide foams and method of producing the same The present invention includes metal oxide foam particles and a method of making the same. A decomposable metal salt feed solution is injected into a hot atomizing gas. The mixture of hot atomizing gas and feed solution is maintained in the reactor until ... | 06/26/1990 |
| 4797270 | Method for the obtention of an especial alumina from the powder produced in metallurgical alumina calcination The process for the manufacture of special aluminas from the powder produced in the calcination of alumina hydrate, as proposed by the invention, achieves the recovery of this by-product, treating it separatedly from the rest of the alumina, in order to c... | 01/10/1989 |
| 4720362 | Transparent aluminum oxynitride and method of manufacture An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with... | 01/19/1988 |
| 4579729 | Wide pore alumina supports High surface area, wide-pore-containing porous aluminas are prepared by mulling together aluminum nitrate derived hydrogels with sodium aluminate derived hydrogels, extruding, drying and calcining at 500°-700° C.... | 04/01/1986 |
| 4579728 | Wide pore alumina supports High surface area, wide-pore-containing porous alumina are prepared by mulling together alumina hydrogel and alpha alumina monohydrate, extruding, drying and calcining at 500°-700° C.... | 04/01/1986 |
| 4562059 | Method of preparing alumina An improved method of preparing alumina, including a first stage in which an alumina hydrogel is formed from seed aluminum hydroxide, and a second stage in which the alumina hydrogel is processed for conversion into alumina. The improvement is in the firs... | 12/31/1985 |
| 4555394 | Process for the preparation of alumina An improved process for the preparation of alumina, including forming an alumina hydrogel from aluminum hydroxide, and processing the alumina hydrogel into alumina. The improvement involves the alumina hydrogel forming step which is connected in the prese... | 11/26/1985 |
| 4534957 | Process for converting hydragillite into boehmite Hydrargillite is converted into boehmite by preparing a suspension (A) of hydrargillite in water with a proportion from 150 g/l to 700 g/l of dry material expressed as Al2 O3, subjecting it to heat treatment under pressure (D) at a t... | 08/13/1985 |
| 4532121 | Process for the preparation of finely divided aluminas or alumina-magnesia spinels having homogeneous pore structure Processes for the preparation of pure alumina powders or pure non-stoichiometric alumina-magnesia spinel powders starting with ammonium alum-based compositions which are dehydrated, the dehydration being carried out on dehydrated salts having a bulk densi... | 07/30/1985 |
| 4520116 | Transparent aluminum oxynitride and method of manufacture An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with... | 05/28/1985 |
| 4492682 | Preparation of ultrapure boehmites and/or pseudo-boehmites Ultrapure and homogeneous boehmites and/or pseudo-boehmites, suitable, whether before or after drying and/or calcination, as, e.g., fillers, binders, thickeners, dispersing agents, and the like, are prepared (i) by admixing an amorphous aluminum hydroxyca... | 01/08/1985 |
| 4399119 | Manufacture of spherical alumina from gibbsite A method of manufacturing spherical alumina particles which comprises the steps of digesting, at an elevated temperature and an elevated pressure, gibbsite with an aqueous hydrochloric acid solution and then forming an aqueous basic aluminum chloride solu... | 08/16/1983 |
| 4377566 | Novel process for the preparation of high purity alumina from ammonium alum Process for preparing high purity aluminas from ammonium alum, the process comprising separately dehydrating the alum and thereafter thermally decomposing the dehydrate, wherein the thermal decomposition is carried out by forcing a gas through a layer of ... | 03/22/1983 |
| 4344928 | Process for preparing alumina particulates, at least a fraction of which being ultrafine boehmite Aqueous suspensions of alumina particulates, at least a portion of which comprising ultrafine boehmite, are prepared by maintaining a pH | 08/17/1982 |
| 4332782 | Method of producing pseudoboehmite A pseudoboehmite having properties suitable for incorporation into a matrix for a zeolite containing catalyst and the process for producing the same from an aluminum sulfate derived gel.... | 06/01/1982 |
| 4320074 | Process for preparing shaped body of alumina The process relates to the preparation of a shaped body having at least one dimension less than 100 microns and comprising alumina or an alumina hydrate. An aqueous composition comprising a water-soluble aluminum compound, for example aluminum chloride, s... | 03/16/1982 |
| 4318896 | Manufacture of alumina particles An alumina particle and a method of its manufacture. The alumina particle comprises a spheroidal alumina particle of about 1/16 inch in diameter and a crush strength of from about 13 to about 16 pounds. The method comprises preparing a mixture of an acidi... | 03/09/1982 |
| 4313923 | Method of producing pseudoboehmites Method of producing pseudoboehmite by reacting an aluminum salt with an aluminate.... | 02/02/1982 |
| 4301033 | High apparent bulk density gamma alumina carrier and method of manufacture of same A catalyst carrier comprising gamma alumina wherein the apparent bulk density is in the range of from 0.65 g/cc to 0.71 g/cc, the total pore volume is in the range of from 0.55 cc/g to 0.65 cc/g, the content of pores having a diameter in the range of from... | 11/17/1981 |
| 4297325 | Method of producing pseudoboehmite from aluminum salt solutions The production process for pseudoboehmite from leach liquors produced in the acid treatment of clays, which liquors contain Fe and alkaline earth ions.... | 10/27/1981 |
| 4292295 | Highly reactive alumina and process for the preparation thereof The invention relates to a new highly reactive alumina and the method of preparing it. The alumina is characterized by an amorphous structure and a specific surface of greater than 600 m2 /g. It is prepared by thermal decomposition of the doubl... | 09/29/1981 |
| 4260589 | Production of alumina from aluminum nitrate solutions Aluminum nitrate solutions are subjected to hydrolysis at elevated temperature and pressure, with the pressure being kept relatively low by continual bleeding of reactant gases from the reaction vessel. The resultant product is a noncrystalline alumina th... | 04/07/1981 |
| 4259311 | Decomposition of AlCl3.6H.sub.2 O in H2 atmosphere AlCl3.6H.sub.2 O is decomposed at a temperature above about 700° C. in the presence of hydrogen to form an alumina product having a very low residual chlorine content.... | 03/31/1981 |
| 4248852 | Process for the production of alumina suitable for use as a catalyst carrier Improved γ-alumina suitable for use as a catalyst carrier having high mechanical strength, a large specific surface area, and a substantially uniform pore size distribution in a relatively small portion of the pore size range below 500 A. Said alumina is... | 02/03/1981 |
| 4241000 | Process for producing polycrystalline cubic aluminum oxynitride A structural ceramic material comprising single phase polycrystalline cubic aluminum oxynitride preferably with at least 97% of theoretical density which displays transparency and isotropic optical, thermal and electrical properties, an infrared cutoff at... | 12/23/1980 |
| 4223000 | Decomposition of aluminum nitrate There is described a method for the decomposition of aluminum nitrate crystals to alumina comprising the steps of: (a) melting the aluminum nitrate crystals; (b) evaporating from the melted crystals in a once through evaporator at the boiling temperature of th... | 09/16/1980 |
